exam Maths Puzzle Numerical Ability

what is the answer to questions 1 to 20 on page 10 exercise 2.4

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exam Other Question

Graph this equation:

y = -2x + 2 Suppose that one solution is 50% alcohol and another solution is 80% alcohol. HOw many liters of each solution should be mixed to make 10.5 liters of a 70% alcohol solution?